World wonders and congress

[ferenginar]

I notice that AI can get additional votes in congress for world wonders, but although I have built many world wonders, I don't seem to get the additional votes.

So, which World Wonders do you need to build to get the additional votes?

Ferenginar (Played all versions but Civ5 noob)

 

[Tatran]

Forbidden Palace gives +2 extra votes.

 

[ferenginar]

Thank you